<!DOCTYPE html>
<html>
<head>
	<title></title>
</head>
<body>

</body>
<script type="text/javascript">
/*
1.removeEventlistener()和addEventListener要保持一致
2.回调函数不能用匿名函数

 */
function fnac(){
	console.log("ac");
}
ac.addEventListener("click",fnac)
document.addEventListener("click",function(){
	removeEventlistener("click",fnac);
})



</script>
</html>